Expedition 2WD V8-5.4L (2009)
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Is the voltage greater than 10 volts?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
For the 4-pin connector, GO to Z4.
For the 7-pin connector, GO to Z3.
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Z3 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (LH STOP/TURN 7-PIN)
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Disconnect: Trailer Tow C4099.
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While applying the brake pedal, measure the voltage between the trailer tow C4099-1, circuit CAT06 (YE), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to Z4.
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Z4 CHECK THE TRAILER TOW LH STOP/TURN RELAY
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Disconnect: Trailer Tow LH Stop/Turn Relay.
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Substitute a known good relay.
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For the 4-pin connector, while applying the brake pedal, measure the voltage between the trailer tow C4098-2, circuit CAT06 (YE), harness side
and ground.
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For the 7-pin connector, while applying the brake pedal, measure the voltage between the trailer tow C4099-1, circuit CAT06 (YE), harness side
and ground.
